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Message-ID: <20061130091334.GM5400@kernel.dk> Date: Thu, 30 Nov 2006 10:13:34 +0100 From: Jens Axboe <jens.axboe@...cle.com> To: linux-kernel@...r.kernel.org Cc: akpm@...l.org, pavel@....cz, bryce@...l.org Subject: Re: CPU hotplug broken with 2GB VMSPLIT On Thu, Nov 30 2006, Jens Axboe wrote: > Hi, > > Just got a new notebook (Lenovo X60), setup a custom kernel and then I > noticed that suspend to ram doesn't work anymore. The machine suspends > just fine, on resume it brings back the text display but reboots after > it has stalled for a few seconds. On the suggestion of Pavel, I tried > testing CPU hotplug, and indeed he was right: I can offline 1 of the > cores fine, bringing it back online freezes the machine for 3-4 seconds > and then reboots. > > carl:/sys/devices/system/cpu/cpu1 # echo 0 > online > carl:/sys/devices/system/cpu/cpu1 # dmesg > Breaking affinity for irq 219 > CPU 1 is now offline > SMP alternatives: switching to UP code > carl:/sys/devices/system/cpu/cpu1 # echo 1 > online > Read from remote host carl: Connection reset by peer > > Booting with maxcpus=1 and resume works fine. Does this ring a bell with > anyone? With highmem enabled and the standard vmsplit, cpu hotplug works > fine for me. Some more clues - booting with noreplacement doesn't fix it, so I think the alternatives code is off the hook. -- Jens Axboe - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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